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- W2179264257 abstract "Abstract Aza Wittig-type reaction of bis(iminophosphorane) 1 with one mole of isocyanate leads to the iminophosphoranes 5 which by treatment with a second mole of isocyanate afforded pyrido[2,3,4-de]quinazolines 6 . Similarly, reaction with ketenes leads to the formation of benzo[de][1,6]naphthyridines 9 . Direct conversion 1 → 6 and 1 → 9 were achieved using two moles of isocyanate or ketene respectively." @default.
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- W2179264257 date "1991-09-01" @default.
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- W2179264257 title "One pot preparation of pyrido[2,3,4-de]quinazolines and benzo[de][1,6]naphthyridines by a consecutive process involving an aza-Wittig/electrocyclic ring-closure/heterocumulene-mediated annelation or intramolecular Diels-Alder cycloaddition sequence." @default.
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- W2179264257 doi "https://doi.org/10.1016/s0040-4039(00)92391-8" @default.
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